Terminals Of Ecu

CHECK DISTANCE CONTROL ECU

Fig 1: Identifying K13 Distance Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K13 ECU connector.

Measure the voltage and resistance of the wire harness side connector.

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
B (K13-1) - GND (K13-12)	L - G	Battery	Always	10 to 14 V
SGND (K13-10) - Body ground	B - Body ground	Ground	Always	Below 1 Ω
GND (K13-12) - Body ground	G - Body ground	Ground	Always	Below 1 Ω
IGB (K13-13) - GND (K13-12)	R - G	Power source supply	Power switch OFF	Below 1 V
IGB (K13-13) - GND (K13-12)	R - G	Power source supply	Power switch ON (IG)	10 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the K13 ECU connector.

Measure the voltage of the connector.

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
LRDD (K13-22) - SGND (K13-10)	BE - B	Millimeter wave radar sensor input signal	Power switch ON (IG)	Pulse generation (see Fig 2)
LRRD (K13-23) - SGND (K13-10)	LG - B	Millimeter wave radar sensor output signal	Power switch ON (IG)	Pulse generation (see Fig 3)
MODE (K13-16) - GND (K13-12)	W - G	Steering pad switch signal (Distance control switch signal)	Power switch ON (IG), steering pad switch signal ON	0 to 2 V
MODE (K13-16) - GND (K13-12)	W - G	Steering pad switch signal (Distance control switch signal)	Power switch ON (IG), steering pad switch signal OFF	9 to 16 V

If the result is not as specified, the ECU may have a malfunction.

Using an oscilloscope, check waveform 1.

Fig 2: Identifying Oscilloscope Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM 1

Item	Content
Symbols (Terminal No.)	LRDD (K13-22) - SGND (K13-10)
Tool Setting	2 V/DIV., 10 msec./DIV.
Vehicle Condition	Power switch ON (IG)

HINT:

As vehicle speed increases, the wavelength shortens.

Using an oscilloscope, check waveform 2.

Fig 3: Identifying Oscilloscope Waveform 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM 2

Item	Content
Symbols (Terminal No.)	LRRD (K13-23) - SGND (K13-10)
Tool Setting	2 V/DIV., 5 msec./DIV.
Vehicle Condition	Power switch ON (IG)

HINT:

As vehicle speed increases, the wavelength shortens.

CHECK HYBRID VEHICLE CONTROL ECU

Fig 4: Identifying A54 And E84 Hybrid Vehicle Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the A54 ECU connectors.

Measure the voltage and resistance of the wire harness side connectors.

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B1 (A54-46) - Body ground	B-R - Body ground	+B power supply	Power switch ON (IG)	10 to 14 V
BATT (A54-20) - Body ground	L - Body ground	BATT power supply	Always	10 to 14 V
E1 (A54-18) - Body ground	W-B - Body ground	Body ground	Always	Below 1 Ω
STP (A54-112) - Body ground	R-B - Body ground	Stop light signal	Power switch ON (IG), brake pedal released	Below 1 V
STP (A54-112) - Body ground	R-B - Body ground	Stop light signal	Power switch ON (IG), brake pedal depressed	10 to 14 V
ST1- (A54-70) - Body ground	G-W - Body ground	Stop light signal	Power switch ON (IG), brake pedal released	10 to 14 V
ST1- (A54-70) - Body ground	G-W - Body ground	Stop light signal	Power switch ON (IG), brake pedal depressed	Below 1 V
CCS (A54-26) - E1 (A54-18)	L-B - W-B	Cruise control main switch signal	Cruise control main switch ON	Below 1 Ω
CCS (A54-26) - E1 (A54-18)	L-B - W-B	Cruise control main switch signal	Cruise control main switch OFF	10 kΩ or higher
CCS (A54-26) - E1 (A54-18)	L-B - W-B	Cruise control main switch signal	SET/COAST switch hold ON	620 to 640 Ω
CCS (A54-26) - E1 (A54-18)	L-B - W-B	Cruise control main switch signal	RES/ACC switch hold ON	235 to 245 Ω
CCS (A54-26) - E1 (A54-18)	L-B - W-B	Cruise control main switch signal	CANCEL switch hold ON	1,510 to 1,570 Ω
CCHG (A54-32) - E1 (A54-18)	R-L - W-B	Distance control switch signal	Power switch ON (IG), cruise control main switch ON, MODE switch ON	Below 1 Ω
CCHG (A54-32) - E1 (A54-18)	R-L - W-B	Distance control switch signal	Power switch ON (IG), cruise control main switch ON, MODE switch OFF	10 kΩ or higher

If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK MILLIMETER WAVE RADAR SENSOR

Fig 5: Identifying B8 Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the B8 sensor connector.

Measure the voltage and resistance of the wire harness side connector.

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
LGND (B8-1) - Body ground	L-B - Body ground	Ground (Distance signal)	Power switch ON (IG)	10 to 14 V
SGND (B8-2) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
IGB (B8-5) - SGND (B8-2)	R - BR	Power source	Power switch ON (IG)	10 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the B8 sensor connector.

Measure the voltage of the connector.

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
LRDD (B8-3) - SGND (B8-2)	G - BR	Millimeter wave radar sensor output signal	Power switch ON (IG)	Pulse generation (see Fig 6)
LRRD (B8-4) - SGND (B8-2)	LG - BR	Millimeter wave radar sensor input signal	Power switch ON (IG)	Pulse generation (see Fig 7)

If the result is not as specified, the sensor may have a malfunction.

Using an oscilloscope, check waveform 1.

Fig 6: Identifying Oscilloscope Waveform 1

WAVEFORM 1

Item	Content
Symbols (Terminal No.)	LRDD (B8-3) - SGND (B8-2)
Tool Setting	2 V/DIV., 10 msec./DIV.
Vehicle Condition	Power switch ON (IG)

HINT:

As vehicle speed increases, the wavelength shortens.

Using an oscilloscope, check waveform 2.

Fig 7: Identifying Oscilloscope Waveform 2

WAVEFORM 2

Item	Content
Symbols (Terminal No.)	LRRD (B8-4) - SGND (B8-2)
Tool Setting	2 V/DIV., 5 msec./DIV.
Vehicle Condition	Power switch ON (IG)

HINT:

As vehicle speed increases, the wavelength shortens.